Contradiction with Proverbs 3:5
While Esther 4:15 suggests a plan and action, Proverbs 3:5 advises trust in the Lord over one's own understanding.
Proverbs 3:5: Trust in the LORD with all thine heart; and lean not unto thine own understanding.
Contradiction with Matthew 6:34
Esther 4:15 involves planning for a future event, whereas Matthew 6:34 advises against worrying about tomorrow.
Matthew 6:34: Take therefore no thought for the morrow: for the morrow shall take thought for the things of itself. Sufficient unto the day [is] the evil thereof.
Contradiction with James 4:13-14
Esther 4:15 assumes actions and decisions, while James 4:13-14 warns against making plans without considering the Lord's will.
James 4:13-14: Go to now, ye that say, To day or to morrow we will go into such a city, and continue there a year, and buy and sell, and get gain:
Contradiction with Matthew 5:44
Esther 4:15 is part of a narrative involving a plan against adversaries, while Matthew 5:44 instructs to love and pray for enemies.
Matthew 5:44: But I say unto you, Love your enemies, bless them that curse you, do good to them that hate you, and pray for them which despitefully use you, and persecute you;